PIRSA:23090109

Examining challenges to LCDM model near and far: from nearby dwarf galaxies to UV bright galaxies at z>5

Kravtsov, A. (2023). Examining challenges to LCDM model near and far: from nearby dwarf galaxies to UV bright galaxies at z>5 . Perimeter Institute. https://pirsa.org/23090109

Kravtsov, Andrey. Examining challenges to LCDM model near and far: from nearby dwarf galaxies to UV bright galaxies at z>5 . Perimeter Institute, Sep. 19, 2023, https://pirsa.org/23090109 

          @misc{ pirsa_PIRSA:23090109,
            doi = {10.48660/23090109},
            url = {https://pirsa.org/23090109},
            author = {Kravtsov, Andrey},
            keywords = {Cosmology},
            language = {en},
            title = {Examining challenges to LCDM model near and far: from nearby dwarf galaxies to UV bright galaxies at z>5 },
            publisher = {Perimeter Institute},
            year = {2023},
            month = {sep},
            note = {PIRSA:23090109 see, \url{https://pirsa.org}}
          }

Andrey Kravtsov University of Chicago

DOI 10.48660/23090109
Collection
Talk Type Scientific Series
Subject

Abstract

 I will present a galaxy formation model within the Lambda Cold Dark Matter (LCDM) framework that is calibrated on the results of galaxy formation simulations and some of the empirical properties of nearby dwarf galaxies. I will then use the model to interpret a number of ostensible challenges to the LCDM framework, such as the "too-big-too-fail problem", "central density problem" and the "planes of satellites" problem and will argue that none of these pose a serious challenge to LCDM, as the corresponding observations can be largely understood within the current galaxy formation modeling. I will also show that the same galaxy formation model can explain the abundance of UV-bright galaxies at z>5 measured by the Hubble Space Telescope and James Webb Space Telescope recently, if the expected increase of burstiness of star formation in galaxies towards early epochs is taken into account.

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Zoom link https://pitp.zoom.us/j/91798519705?pwd=Nk9rM0tFSXcrWDhLdXFhVmJWbGgvUT09